[virt-tools-list] Question about the image format

[Dustin Xiong]

> Date: Tue, 6 Apr 2010 14:17:47 +0800
> Subject: Re: [virt-tools-list] Question about the image format
> From: miles.kuo at gmail.com
> To: x_k_123 at hotmail.com
> CC: virt-tools-list at redhat.com
> 
> The virt-manager supports it I think. I've tried it on
> virt-manager-0.8.3 and it works well as the qemu-kvm commands.
> 
> Could you paste your XML file of the VM under virt-manager here?
>
I can't create the VM, so I didn't have the XML file.
But I could use the same way to create VM2. The only differences is the disk images.
The vm2.img comes from this command : qemu-img create -f qcow vm2.img 4G
The vm3.img comes from the command :  qemu-img create -b vm1.img -f qcow vm3.img

virsh # create vm3.xml
error: Failed to create domain from vm3.xml
error: internal error unable to start guest: qemu: could not open disk image /var/lib/libvirt/images/vm3.img

virsh # create vm2.xml
Domain vm2 created from vm2.xml

The XML file as below:
<domain type='kvm'>
  <name>vm2</name>
  <uuid>7cb40798-1247-85e3-5e5b-e044eafbfff3</uuid>
  <memory>524288</memory>
  <currentMemory>524288</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type arch='i686' machine='pc-0.11'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow'/>
      <source file='/var/lib/libvirt/images/vm2.img'/>
      <target dev='hda' bus='ide'/>
    </disk>
    <disk type='block' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
    </disk>
    <interface type='network'>
      <mac address='52:54:00:5d:2c:c6'/>
      <source network='default'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target port='0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes' keymap='en-us'/>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
    </video>
  </devices>
</domain>


<domain type='kvm'>
  <name>vm3</name>
  <uuid>7cb40798-1247-85e3-5e5b-e044eafbfff3</uuid>
  <memory>524288</memory>
  <currentMemory>524288</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type arch='i686' machine='pc-0.11'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow'/>
      <source file='/var/lib/libvirt/images/vm3.img'/>
      <target dev='hda' bus='ide'/>
    </disk>
    <disk type='block' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
    </disk>
    <interface type='network'>
      <mac address='52:54:00:5d:2c:c6'/>
      <source network='default'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target port='0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes' keymap='en-us'/>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
    </video>
  </devices>
</domain>


> > I use the command 'qemu-img create -b vm1.img -f qcow vdisk.img'
> > create a new image vdisk.img. When I use virt-manager create a new VM based
> > on vdisk.img, failed.
> > The error as below:
> >
> > Unable to complete install '<class 'libvirt.libvirtError'> internal error
> > unable to start guest: qemu: could not open disk image
> > /media/disk/images/vdisk.img
> >
> > Traceback (most recent call last):
> >   File "/usr/local/share/virt-manager/virtManager/create.py", line 1437, in
> > do_install
> >     dom = guest.start_install(False, meter = meter)
> >   File "/usr/local/lib/python2.6/dist-packages/virtinst/Guest.py", line 795,
> > in start_install
> >     return self._do_install(consolecb, meter, removeOld, wait)
> >   File "/usr/local/lib/python2.6/dist-packages/virtinst/Guest.py", line 896,
> > in _do_install
> >     self.domain = self.conn.createLinux(install_xml, 0)
> >   File "/usr/lib/python2.6/dist-packages! /libvirt.py", line 1077, in
> > createLinux
> >     if ret is None:raise libvirtError('virDomainCreateLinux() failed',
> > conn=self)
> > libvirtError: internal error unable to start guest: qemu: could not open
> > disk image /media/disk/images/vdisk.img
> >
> > But if I don't use virt-manager. I just use the command
> > kvm -hda vdisk.img -m 1024 -cdrom rhel-server-5.4-i386-dvd.iso -boot d
> > or kvm vdisk.img -m 1024
> > The VM could running.
> >
> > So I want to ask whether the virt-manager support the disk created by
> > 'qemu-img create -b vm1.img -f qcow vdisk.img' or not.
> >
> > Thank you very much.
> >
> > -Dustin.
> >
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